Header image on our outgoing email is ruined when secured

Question

Our outgoing e-mail all gets a company header image. It's a 650 x 66 gif image that is applied to all outgoing messages right before hitting the ironport.
This header image goes out fine unsecured, but if we secure the message we run into a problem.
When I view the secure e-mail in CRES, I get a broken image link, and the image URL is changed to: cid:[email protected]
Although in the secure e-mail there is an attachment called short_header.gif. If I click on this attachment I see the header image open in a new browser window.
This is NOT what we want. We want the short_header.gif to be in the body of the message, like company letterhead. We were told prior to purchasing this appliance that this was possible. This is why we didn't go with Tumbleweed for secure e-mail, because that stripped the image and sent it as an attachment.
Any idea's how to get this working?

Answer 1

We are sending out the cid: matched to the content-id.
For example, the content id header before the data is:
------=_Part_27139_31810384.1256219199103
Content-Type: image/gif; name="short header.gif"
Content-Transfer-Encoding: base64
Content-ID: <200910229463981>
Content-Disposition: inline; filename="short header.gif"
and the image tag where we refrence this is embedded as:
This DOES work, but once we encrypt the message this breaks for some stupid reason. The CID isn't altered. It just shows short header.gif as an attachment and a broken image link at the top of the screen.
Any ideas?